Why it is so good for documentation?

I am looking for Wiki system to document small software projects. I need to make technical and user documentation. After some research I ened up with two choices:

- DokuWiki for being made especially for documentation,- TWiki for wysiwyg editing and plugins for every possible use.

I am not so sure about DokuWiki, so please, can you tell me which features make it "especially for documentation"? I really like wysiwyg way of editing pages so my choice for now is TWiki, which features of DokuWiki make it the "killer-wiki" for documentation?